The power consumption of any electronic device is in VA.
This is corrected for power factor.
You get BILLED for watts, or KWH (kilowatt hours) but consume VA, which except for a resistive load is always higher. Power companies will bill large, typically industrial users slightly more (surcharge) for such low PF loads.
What does the plate say on the equipment? In general, I'd be reluctant to convert a device with a 20amp connector to a 15 amp service. If this is a large power amp with 'ample' capacitance, you may get a pretty good turnon surge, even if you never crank it up or have higher sensitivity speakers.
This is corrected for power factor.
You get BILLED for watts, or KWH (kilowatt hours) but consume VA, which except for a resistive load is always higher. Power companies will bill large, typically industrial users slightly more (surcharge) for such low PF loads.
What does the plate say on the equipment? In general, I'd be reluctant to convert a device with a 20amp connector to a 15 amp service. If this is a large power amp with 'ample' capacitance, you may get a pretty good turnon surge, even if you never crank it up or have higher sensitivity speakers.